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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 1999, 2012
5 * Author(s): Hartmut Penner (hp@de.ibm.com),
6 * Martin Schwidefsky (schwidefsky@de.ibm.com)
7 *
8 * Derived from "arch/i386/kernel/setup.c"
9 * Copyright (C) 1995, Linus Torvalds
10 */
11
12/*
13 * This file handles the architecture-dependent parts of initialization
14 */
15
16#define KMSG_COMPONENT "setup"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/errno.h>
20#include <linux/export.h>
21#include <linux/sched.h>
22#include <linux/sched/task.h>
23#include <linux/cpu.h>
24#include <linux/kernel.h>
25#include <linux/memblock.h>
26#include <linux/mm.h>
27#include <linux/stddef.h>
28#include <linux/unistd.h>
29#include <linux/ptrace.h>
30#include <linux/random.h>
31#include <linux/user.h>
32#include <linux/tty.h>
33#include <linux/ioport.h>
34#include <linux/delay.h>
35#include <linux/init.h>
36#include <linux/initrd.h>
37#include <linux/root_dev.h>
38#include <linux/console.h>
39#include <linux/kernel_stat.h>
40#include <linux/dma-map-ops.h>
41#include <linux/device.h>
42#include <linux/notifier.h>
43#include <linux/pfn.h>
44#include <linux/ctype.h>
45#include <linux/reboot.h>
46#include <linux/topology.h>
47#include <linux/kexec.h>
48#include <linux/crash_dump.h>
49#include <linux/memory.h>
50#include <linux/compat.h>
51#include <linux/start_kernel.h>
52#include <linux/hugetlb.h>
53#include <linux/kmemleak.h>
54
55#include <asm/archrandom.h>
56#include <asm/boot_data.h>
57#include <asm/ipl.h>
58#include <asm/facility.h>
59#include <asm/smp.h>
60#include <asm/mmu_context.h>
61#include <asm/cpcmd.h>
62#include <asm/abs_lowcore.h>
63#include <asm/nmi.h>
64#include <asm/irq.h>
65#include <asm/page.h>
66#include <asm/ptrace.h>
67#include <asm/sections.h>
68#include <asm/ebcdic.h>
69#include <asm/diag.h>
70#include <asm/os_info.h>
71#include <asm/sclp.h>
72#include <asm/stacktrace.h>
73#include <asm/sysinfo.h>
74#include <asm/numa.h>
75#include <asm/alternative.h>
76#include <asm/nospec-branch.h>
77#include <asm/physmem_info.h>
78#include <asm/maccess.h>
79#include <asm/uv.h>
80#include <asm/asm-offsets.h>
81#include "entry.h"
82
83/*
84 * Machine setup..
85 */
86unsigned int console_mode = 0;
87EXPORT_SYMBOL(console_mode);
88
89unsigned int console_devno = -1;
90EXPORT_SYMBOL(console_devno);
91
92unsigned int console_irq = -1;
93EXPORT_SYMBOL(console_irq);
94
95/*
96 * Some code and data needs to stay below 2 GB, even when the kernel would be
97 * relocated above 2 GB, because it has to use 31 bit addresses.
98 * Such code and data is part of the .amode31 section.
99 */
100char __amode31_ref *__samode31 = _samode31;
101char __amode31_ref *__eamode31 = _eamode31;
102char __amode31_ref *__stext_amode31 = _stext_amode31;
103char __amode31_ref *__etext_amode31 = _etext_amode31;
104struct exception_table_entry __amode31_ref *__start_amode31_ex_table = _start_amode31_ex_table;
105struct exception_table_entry __amode31_ref *__stop_amode31_ex_table = _stop_amode31_ex_table;
106
107/*
108 * Control registers CR2, CR5 and CR15 are initialized with addresses
109 * of tables that must be placed below 2G which is handled by the AMODE31
110 * sections.
111 * Because the AMODE31 sections are relocated below 2G at startup,
112 * the content of control registers CR2, CR5 and CR15 must be updated
113 * with new addresses after the relocation. The initial initialization of
114 * control registers occurs in head64.S and then gets updated again after AMODE31
115 * relocation. We must access the relevant AMODE31 tables indirectly via
116 * pointers placed in the .amode31.refs linker section. Those pointers get
117 * updated automatically during AMODE31 relocation and always contain a valid
118 * address within AMODE31 sections.
119 */
120
121static __amode31_data u32 __ctl_duct_amode31[16] __aligned(64);
122
123static __amode31_data u64 __ctl_aste_amode31[8] __aligned(64) = {
124 [1] = 0xffffffffffffffff
125};
126
127static __amode31_data u32 __ctl_duald_amode31[32] __aligned(128) = {
128 0x80000000, 0, 0, 0,
129 0x80000000, 0, 0, 0,
130 0x80000000, 0, 0, 0,
131 0x80000000, 0, 0, 0,
132 0x80000000, 0, 0, 0,
133 0x80000000, 0, 0, 0,
134 0x80000000, 0, 0, 0,
135 0x80000000, 0, 0, 0
136};
137
138static __amode31_data u32 __ctl_linkage_stack_amode31[8] __aligned(64) = {
139 0, 0, 0x89000000, 0,
140 0, 0, 0x8a000000, 0
141};
142
143static u64 __amode31_ref *__ctl_aste = __ctl_aste_amode31;
144static u32 __amode31_ref *__ctl_duald = __ctl_duald_amode31;
145static u32 __amode31_ref *__ctl_linkage_stack = __ctl_linkage_stack_amode31;
146static u32 __amode31_ref *__ctl_duct = __ctl_duct_amode31;
147
148unsigned long __bootdata_preserved(max_mappable);
149struct physmem_info __bootdata(physmem_info);
150
151struct vm_layout __bootdata_preserved(vm_layout);
152EXPORT_SYMBOL(vm_layout);
153int __bootdata_preserved(__kaslr_enabled);
154unsigned int __bootdata_preserved(zlib_dfltcc_support);
155EXPORT_SYMBOL(zlib_dfltcc_support);
156u64 __bootdata_preserved(stfle_fac_list[16]);
157EXPORT_SYMBOL(stfle_fac_list);
158struct oldmem_data __bootdata_preserved(oldmem_data);
159
160unsigned long VMALLOC_START;
161EXPORT_SYMBOL(VMALLOC_START);
162
163unsigned long VMALLOC_END;
164EXPORT_SYMBOL(VMALLOC_END);
165
166struct page *vmemmap;
167EXPORT_SYMBOL(vmemmap);
168unsigned long vmemmap_size;
169
170unsigned long MODULES_VADDR;
171unsigned long MODULES_END;
172
173/* An array with a pointer to the lowcore of every CPU. */
174struct lowcore *lowcore_ptr[NR_CPUS];
175EXPORT_SYMBOL(lowcore_ptr);
176
177DEFINE_STATIC_KEY_FALSE(cpu_has_bear);
178
179/*
180 * The Write Back bit position in the physaddr is given by the SLPC PCI.
181 * Leaving the mask zero always uses write through which is safe
182 */
183unsigned long mio_wb_bit_mask __ro_after_init;
184
185/*
186 * This is set up by the setup-routine at boot-time
187 * for S390 need to find out, what we have to setup
188 * using address 0x10400 ...
189 */
190
191#include <asm/setup.h>
192
193/*
194 * condev= and conmode= setup parameter.
195 */
196
197static int __init condev_setup(char *str)
198{
199 int vdev;
200
201 vdev = simple_strtoul(str, &str, 0);
202 if (vdev >= 0 && vdev < 65536) {
203 console_devno = vdev;
204 console_irq = -1;
205 }
206 return 1;
207}
208
209__setup("condev=", condev_setup);
210
211static void __init set_preferred_console(void)
212{
213 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
214 add_preferred_console("ttyS", 0, NULL);
215 else if (CONSOLE_IS_3270)
216 add_preferred_console("tty3270", 0, NULL);
217 else if (CONSOLE_IS_VT220)
218 add_preferred_console("ttysclp", 0, NULL);
219 else if (CONSOLE_IS_HVC)
220 add_preferred_console("hvc", 0, NULL);
221}
222
223static int __init conmode_setup(char *str)
224{
225#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
226 if (!strcmp(str, "hwc") || !strcmp(str, "sclp"))
227 SET_CONSOLE_SCLP;
228#endif
229#if defined(CONFIG_TN3215_CONSOLE)
230 if (!strcmp(str, "3215"))
231 SET_CONSOLE_3215;
232#endif
233#if defined(CONFIG_TN3270_CONSOLE)
234 if (!strcmp(str, "3270"))
235 SET_CONSOLE_3270;
236#endif
237 set_preferred_console();
238 return 1;
239}
240
241__setup("conmode=", conmode_setup);
242
243static void __init conmode_default(void)
244{
245 char query_buffer[1024];
246 char *ptr;
247
248 if (MACHINE_IS_VM) {
249 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
250 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
251 ptr = strstr(query_buffer, "SUBCHANNEL =");
252 console_irq = simple_strtoul(ptr + 13, NULL, 16);
253 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
254 ptr = strstr(query_buffer, "CONMODE");
255 /*
256 * Set the conmode to 3215 so that the device recognition
257 * will set the cu_type of the console to 3215. If the
258 * conmode is 3270 and we don't set it back then both
259 * 3215 and the 3270 driver will try to access the console
260 * device (3215 as console and 3270 as normal tty).
261 */
262 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
263 if (ptr == NULL) {
264#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
265 SET_CONSOLE_SCLP;
266#endif
267 return;
268 }
269 if (str_has_prefix(ptr + 8, "3270")) {
270#if defined(CONFIG_TN3270_CONSOLE)
271 SET_CONSOLE_3270;
272#elif defined(CONFIG_TN3215_CONSOLE)
273 SET_CONSOLE_3215;
274#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
275 SET_CONSOLE_SCLP;
276#endif
277 } else if (str_has_prefix(ptr + 8, "3215")) {
278#if defined(CONFIG_TN3215_CONSOLE)
279 SET_CONSOLE_3215;
280#elif defined(CONFIG_TN3270_CONSOLE)
281 SET_CONSOLE_3270;
282#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
283 SET_CONSOLE_SCLP;
284#endif
285 }
286 } else if (MACHINE_IS_KVM) {
287 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
288 SET_CONSOLE_VT220;
289 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
290 SET_CONSOLE_SCLP;
291 else
292 SET_CONSOLE_HVC;
293 } else {
294#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
295 SET_CONSOLE_SCLP;
296#endif
297 }
298}
299
300#ifdef CONFIG_CRASH_DUMP
301static void __init setup_zfcpdump(void)
302{
303 if (!is_ipl_type_dump())
304 return;
305 if (oldmem_data.start)
306 return;
307 strlcat(boot_command_line, " cio_ignore=all,!ipldev,!condev", COMMAND_LINE_SIZE);
308 console_loglevel = 2;
309}
310#else
311static inline void setup_zfcpdump(void) {}
312#endif /* CONFIG_CRASH_DUMP */
313
314 /*
315 * Reboot, halt and power_off stubs. They just call _machine_restart,
316 * _machine_halt or _machine_power_off.
317 */
318
319void machine_restart(char *command)
320{
321 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
322 /*
323 * Only unblank the console if we are called in enabled
324 * context or a bust_spinlocks cleared the way for us.
325 */
326 console_unblank();
327 _machine_restart(command);
328}
329
330void machine_halt(void)
331{
332 if (!in_interrupt() || oops_in_progress)
333 /*
334 * Only unblank the console if we are called in enabled
335 * context or a bust_spinlocks cleared the way for us.
336 */
337 console_unblank();
338 _machine_halt();
339}
340
341void machine_power_off(void)
342{
343 if (!in_interrupt() || oops_in_progress)
344 /*
345 * Only unblank the console if we are called in enabled
346 * context or a bust_spinlocks cleared the way for us.
347 */
348 console_unblank();
349 _machine_power_off();
350}
351
352/*
353 * Dummy power off function.
354 */
355void (*pm_power_off)(void) = machine_power_off;
356EXPORT_SYMBOL_GPL(pm_power_off);
357
358void *restart_stack;
359
360unsigned long stack_alloc(void)
361{
362#ifdef CONFIG_VMAP_STACK
363 void *ret;
364
365 ret = __vmalloc_node(THREAD_SIZE, THREAD_SIZE, THREADINFO_GFP,
366 NUMA_NO_NODE, __builtin_return_address(0));
367 kmemleak_not_leak(ret);
368 return (unsigned long)ret;
369#else
370 return __get_free_pages(GFP_KERNEL, THREAD_SIZE_ORDER);
371#endif
372}
373
374void stack_free(unsigned long stack)
375{
376#ifdef CONFIG_VMAP_STACK
377 vfree((void *) stack);
378#else
379 free_pages(stack, THREAD_SIZE_ORDER);
380#endif
381}
382
383static unsigned long __init stack_alloc_early(void)
384{
385 unsigned long stack;
386
387 stack = (unsigned long)memblock_alloc(THREAD_SIZE, THREAD_SIZE);
388 if (!stack) {
389 panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
390 __func__, THREAD_SIZE, THREAD_SIZE);
391 }
392 return stack;
393}
394
395static void __init setup_lowcore(void)
396{
397 struct lowcore *lc, *abs_lc;
398
399 /*
400 * Setup lowcore for boot cpu
401 */
402 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * PAGE_SIZE);
403 lc = memblock_alloc_low(sizeof(*lc), sizeof(*lc));
404 if (!lc)
405 panic("%s: Failed to allocate %zu bytes align=%zx\n",
406 __func__, sizeof(*lc), sizeof(*lc));
407
408 lc->pcpu = (unsigned long)per_cpu_ptr(&pcpu_devices, 0);
409 lc->restart_psw.mask = PSW_KERNEL_BITS & ~PSW_MASK_DAT;
410 lc->restart_psw.addr = __pa(restart_int_handler);
411 lc->external_new_psw.mask = PSW_KERNEL_BITS;
412 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
413 lc->svc_new_psw.mask = PSW_KERNEL_BITS;
414 lc->svc_new_psw.addr = (unsigned long) system_call;
415 lc->program_new_psw.mask = PSW_KERNEL_BITS;
416 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
417 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
418 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
419 lc->io_new_psw.mask = PSW_KERNEL_BITS;
420 lc->io_new_psw.addr = (unsigned long) io_int_handler;
421 lc->clock_comparator = clock_comparator_max;
422 lc->current_task = (unsigned long)&init_task;
423 lc->lpp = LPP_MAGIC;
424 lc->machine_flags = get_lowcore()->machine_flags;
425 lc->preempt_count = get_lowcore()->preempt_count;
426 nmi_alloc_mcesa_early(&lc->mcesad);
427 lc->sys_enter_timer = get_lowcore()->sys_enter_timer;
428 lc->exit_timer = get_lowcore()->exit_timer;
429 lc->user_timer = get_lowcore()->user_timer;
430 lc->system_timer = get_lowcore()->system_timer;
431 lc->steal_timer = get_lowcore()->steal_timer;
432 lc->last_update_timer = get_lowcore()->last_update_timer;
433 lc->last_update_clock = get_lowcore()->last_update_clock;
434 /*
435 * Allocate the global restart stack which is the same for
436 * all CPUs in case *one* of them does a PSW restart.
437 */
438 restart_stack = (void *)(stack_alloc_early() + STACK_INIT_OFFSET);
439 lc->mcck_stack = stack_alloc_early() + STACK_INIT_OFFSET;
440 lc->async_stack = stack_alloc_early() + STACK_INIT_OFFSET;
441 lc->nodat_stack = stack_alloc_early() + STACK_INIT_OFFSET;
442 lc->kernel_stack = get_lowcore()->kernel_stack;
443 /*
444 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
445 * restart data to the absolute zero lowcore. This is necessary if
446 * PSW restart is done on an offline CPU that has lowcore zero.
447 */
448 lc->restart_stack = (unsigned long) restart_stack;
449 lc->restart_fn = (unsigned long) do_restart;
450 lc->restart_data = 0;
451 lc->restart_source = -1U;
452 lc->spinlock_lockval = arch_spin_lockval(0);
453 lc->spinlock_index = 0;
454 arch_spin_lock_setup(0);
455 lc->return_lpswe = gen_lpswe(__LC_RETURN_PSW);
456 lc->return_mcck_lpswe = gen_lpswe(__LC_RETURN_MCCK_PSW);
457 lc->preempt_count = PREEMPT_DISABLED;
458 lc->kernel_asce = get_lowcore()->kernel_asce;
459 lc->user_asce = get_lowcore()->user_asce;
460
461 system_ctlreg_init_save_area(lc);
462 abs_lc = get_abs_lowcore();
463 abs_lc->restart_stack = lc->restart_stack;
464 abs_lc->restart_fn = lc->restart_fn;
465 abs_lc->restart_data = lc->restart_data;
466 abs_lc->restart_source = lc->restart_source;
467 abs_lc->restart_psw = lc->restart_psw;
468 abs_lc->restart_flags = RESTART_FLAG_CTLREGS;
469 abs_lc->program_new_psw = lc->program_new_psw;
470 abs_lc->mcesad = lc->mcesad;
471 put_abs_lowcore(abs_lc);
472
473 set_prefix(__pa(lc));
474 lowcore_ptr[0] = lc;
475 if (abs_lowcore_map(0, lowcore_ptr[0], false))
476 panic("Couldn't setup absolute lowcore");
477}
478
479static struct resource code_resource = {
480 .name = "Kernel code",
481 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
482};
483
484static struct resource data_resource = {
485 .name = "Kernel data",
486 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
487};
488
489static struct resource bss_resource = {
490 .name = "Kernel bss",
491 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
492};
493
494static struct resource __initdata *standard_resources[] = {
495 &code_resource,
496 &data_resource,
497 &bss_resource,
498};
499
500static void __init setup_resources(void)
501{
502 struct resource *res, *std_res, *sub_res;
503 phys_addr_t start, end;
504 int j;
505 u64 i;
506
507 code_resource.start = __pa_symbol(_text);
508 code_resource.end = __pa_symbol(_etext) - 1;
509 data_resource.start = __pa_symbol(_etext);
510 data_resource.end = __pa_symbol(_edata) - 1;
511 bss_resource.start = __pa_symbol(__bss_start);
512 bss_resource.end = __pa_symbol(__bss_stop) - 1;
513
514 for_each_mem_range(i, &start, &end) {
515 res = memblock_alloc(sizeof(*res), 8);
516 if (!res)
517 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
518 __func__, sizeof(*res), 8);
519 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
520
521 res->name = "System RAM";
522 res->start = start;
523 /*
524 * In memblock, end points to the first byte after the
525 * range while in resources, end points to the last byte in
526 * the range.
527 */
528 res->end = end - 1;
529 request_resource(&iomem_resource, res);
530
531 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
532 std_res = standard_resources[j];
533 if (std_res->start < res->start ||
534 std_res->start > res->end)
535 continue;
536 if (std_res->end > res->end) {
537 sub_res = memblock_alloc(sizeof(*sub_res), 8);
538 if (!sub_res)
539 panic("%s: Failed to allocate %zu bytes align=0x%x\n",
540 __func__, sizeof(*sub_res), 8);
541 *sub_res = *std_res;
542 sub_res->end = res->end;
543 std_res->start = res->end + 1;
544 request_resource(res, sub_res);
545 } else {
546 request_resource(res, std_res);
547 }
548 }
549 }
550#ifdef CONFIG_CRASH_DUMP
551 /*
552 * Re-add removed crash kernel memory as reserved memory. This makes
553 * sure it will be mapped with the identity mapping and struct pages
554 * will be created, so it can be resized later on.
555 * However add it later since the crash kernel resource should not be
556 * part of the System RAM resource.
557 */
558 if (crashk_res.end) {
559 memblock_add_node(crashk_res.start, resource_size(&crashk_res),
560 0, MEMBLOCK_NONE);
561 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
562 insert_resource(&iomem_resource, &crashk_res);
563 }
564#endif
565}
566
567static void __init setup_memory_end(void)
568{
569 max_pfn = max_low_pfn = PFN_DOWN(ident_map_size);
570 pr_notice("The maximum memory size is %luMB\n", ident_map_size >> 20);
571}
572
573#ifdef CONFIG_CRASH_DUMP
574
575/*
576 * When kdump is enabled, we have to ensure that no memory from the area
577 * [0 - crashkernel memory size] is set offline - it will be exchanged with
578 * the crashkernel memory region when kdump is triggered. The crashkernel
579 * memory region can never get offlined (pages are unmovable).
580 */
581static int kdump_mem_notifier(struct notifier_block *nb,
582 unsigned long action, void *data)
583{
584 struct memory_notify *arg = data;
585
586 if (action != MEM_GOING_OFFLINE)
587 return NOTIFY_OK;
588 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
589 return NOTIFY_BAD;
590 return NOTIFY_OK;
591}
592
593static struct notifier_block kdump_mem_nb = {
594 .notifier_call = kdump_mem_notifier,
595};
596
597#endif
598
599/*
600 * Reserve page tables created by decompressor
601 */
602static void __init reserve_pgtables(void)
603{
604 unsigned long start, end;
605 struct reserved_range *range;
606
607 for_each_physmem_reserved_type_range(RR_VMEM, range, &start, &end)
608 memblock_reserve(start, end - start);
609}
610
611/*
612 * Reserve memory for kdump kernel to be loaded with kexec
613 */
614static void __init reserve_crashkernel(void)
615{
616#ifdef CONFIG_CRASH_DUMP
617 unsigned long long crash_base, crash_size;
618 phys_addr_t low, high;
619 int rc;
620
621 rc = parse_crashkernel(boot_command_line, ident_map_size,
622 &crash_size, &crash_base, NULL, NULL);
623
624 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
625 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
626 if (rc || crash_size == 0)
627 return;
628
629 if (memblock.memory.regions[0].size < crash_size) {
630 pr_info("crashkernel reservation failed: %s\n",
631 "first memory chunk must be at least crashkernel size");
632 return;
633 }
634
635 low = crash_base ?: oldmem_data.start;
636 high = low + crash_size;
637 if (low >= oldmem_data.start && high <= oldmem_data.start + oldmem_data.size) {
638 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
639 crash_base = low;
640 } else {
641 /* Find suitable area in free memory */
642 low = max_t(unsigned long, crash_size, sclp.hsa_size);
643 high = crash_base ? crash_base + crash_size : ULONG_MAX;
644
645 if (crash_base && crash_base < low) {
646 pr_info("crashkernel reservation failed: %s\n",
647 "crash_base too low");
648 return;
649 }
650 low = crash_base ?: low;
651 crash_base = memblock_phys_alloc_range(crash_size,
652 KEXEC_CRASH_MEM_ALIGN,
653 low, high);
654 }
655
656 if (!crash_base) {
657 pr_info("crashkernel reservation failed: %s\n",
658 "no suitable area found");
659 return;
660 }
661
662 if (register_memory_notifier(&kdump_mem_nb)) {
663 memblock_phys_free(crash_base, crash_size);
664 return;
665 }
666
667 if (!oldmem_data.start && MACHINE_IS_VM)
668 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
669 crashk_res.start = crash_base;
670 crashk_res.end = crash_base + crash_size - 1;
671 memblock_remove(crash_base, crash_size);
672 pr_info("Reserving %lluMB of memory at %lluMB "
673 "for crashkernel (System RAM: %luMB)\n",
674 crash_size >> 20, crash_base >> 20,
675 (unsigned long)memblock.memory.total_size >> 20);
676 os_info_crashkernel_add(crash_base, crash_size);
677#endif
678}
679
680/*
681 * Reserve the initrd from being used by memblock
682 */
683static void __init reserve_initrd(void)
684{
685 unsigned long addr, size;
686
687 if (!IS_ENABLED(CONFIG_BLK_DEV_INITRD) || !get_physmem_reserved(RR_INITRD, &addr, &size))
688 return;
689 initrd_start = (unsigned long)__va(addr);
690 initrd_end = initrd_start + size;
691 memblock_reserve(addr, size);
692}
693
694/*
695 * Reserve the memory area used to pass the certificate lists
696 */
697static void __init reserve_certificate_list(void)
698{
699 if (ipl_cert_list_addr)
700 memblock_reserve(ipl_cert_list_addr, ipl_cert_list_size);
701}
702
703static void __init reserve_physmem_info(void)
704{
705 unsigned long addr, size;
706
707 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
708 memblock_reserve(addr, size);
709}
710
711static void __init free_physmem_info(void)
712{
713 unsigned long addr, size;
714
715 if (get_physmem_reserved(RR_MEM_DETECT_EXTENDED, &addr, &size))
716 memblock_phys_free(addr, size);
717}
718
719static void __init memblock_add_physmem_info(void)
720{
721 unsigned long start, end;
722 int i;
723
724 pr_debug("physmem info source: %s (%hhd)\n",
725 get_physmem_info_source(), physmem_info.info_source);
726 /* keep memblock lists close to the kernel */
727 memblock_set_bottom_up(true);
728 for_each_physmem_usable_range(i, &start, &end)
729 memblock_add(start, end - start);
730 for_each_physmem_online_range(i, &start, &end)
731 memblock_physmem_add(start, end - start);
732 memblock_set_bottom_up(false);
733 memblock_set_node(0, ULONG_MAX, &memblock.memory, 0);
734}
735
736/*
737 * Reserve memory used for lowcore.
738 */
739static void __init reserve_lowcore(void)
740{
741 void *lowcore_start = get_lowcore();
742 void *lowcore_end = lowcore_start + sizeof(struct lowcore);
743 void *start, *end;
744
745 if ((void *)__identity_base < lowcore_end) {
746 start = max(lowcore_start, (void *)__identity_base);
747 end = min(lowcore_end, (void *)(__identity_base + ident_map_size));
748 memblock_reserve(__pa(start), __pa(end));
749 }
750}
751
752/*
753 * Reserve memory used for absolute lowcore/command line/kernel image.
754 */
755static void __init reserve_kernel(void)
756{
757 memblock_reserve(0, STARTUP_NORMAL_OFFSET);
758 memblock_reserve(OLDMEM_BASE, sizeof(unsigned long));
759 memblock_reserve(OLDMEM_SIZE, sizeof(unsigned long));
760 memblock_reserve(physmem_info.reserved[RR_AMODE31].start, __eamode31 - __samode31);
761 memblock_reserve(__pa(sclp_early_sccb), EXT_SCCB_READ_SCP);
762 memblock_reserve(__pa(_stext), _end - _stext);
763}
764
765static void __init setup_memory(void)
766{
767 phys_addr_t start, end;
768 u64 i;
769
770 /*
771 * Init storage key for present memory
772 */
773 for_each_mem_range(i, &start, &end)
774 storage_key_init_range(start, end);
775
776 psw_set_key(PAGE_DEFAULT_KEY);
777}
778
779static void __init relocate_amode31_section(void)
780{
781 unsigned long amode31_size = __eamode31 - __samode31;
782 long amode31_offset, *ptr;
783
784 amode31_offset = AMODE31_START - (unsigned long)__samode31;
785 pr_info("Relocating AMODE31 section of size 0x%08lx\n", amode31_size);
786
787 /* Move original AMODE31 section to the new one */
788 memmove((void *)physmem_info.reserved[RR_AMODE31].start, __samode31, amode31_size);
789 /* Zero out the old AMODE31 section to catch invalid accesses within it */
790 memset(__samode31, 0, amode31_size);
791
792 /* Update all AMODE31 region references */
793 for (ptr = _start_amode31_refs; ptr != _end_amode31_refs; ptr++)
794 *ptr += amode31_offset;
795}
796
797/* This must be called after AMODE31 relocation */
798static void __init setup_cr(void)
799{
800 union ctlreg2 cr2;
801 union ctlreg5 cr5;
802 union ctlreg15 cr15;
803
804 __ctl_duct[1] = (unsigned long)__ctl_aste;
805 __ctl_duct[2] = (unsigned long)__ctl_aste;
806 __ctl_duct[4] = (unsigned long)__ctl_duald;
807
808 /* Update control registers CR2, CR5 and CR15 */
809 local_ctl_store(2, &cr2.reg);
810 local_ctl_store(5, &cr5.reg);
811 local_ctl_store(15, &cr15.reg);
812 cr2.ducto = (unsigned long)__ctl_duct >> 6;
813 cr5.pasteo = (unsigned long)__ctl_duct >> 6;
814 cr15.lsea = (unsigned long)__ctl_linkage_stack >> 3;
815 system_ctl_load(2, &cr2.reg);
816 system_ctl_load(5, &cr5.reg);
817 system_ctl_load(15, &cr15.reg);
818}
819
820/*
821 * Add system information as device randomness
822 */
823static void __init setup_randomness(void)
824{
825 struct sysinfo_3_2_2 *vmms;
826
827 vmms = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
828 if (!vmms)
829 panic("Failed to allocate memory for sysinfo structure\n");
830 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
831 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
832 memblock_free(vmms, PAGE_SIZE);
833
834 if (cpacf_query_func(CPACF_PRNO, CPACF_PRNO_TRNG))
835 static_branch_enable(&s390_arch_random_available);
836}
837
838/*
839 * Issue diagnose 318 to set the control program name and
840 * version codes.
841 */
842static void __init setup_control_program_code(void)
843{
844 union diag318_info diag318_info = {
845 .cpnc = CPNC_LINUX,
846 .cpvc = 0,
847 };
848
849 if (!sclp.has_diag318)
850 return;
851
852 diag_stat_inc(DIAG_STAT_X318);
853 asm volatile("diag %0,0,0x318\n" : : "d" (diag318_info.val));
854}
855
856/*
857 * Print the component list from the IPL report
858 */
859static void __init log_component_list(void)
860{
861 struct ipl_rb_component_entry *ptr, *end;
862 char *str;
863
864 if (!early_ipl_comp_list_addr)
865 return;
866 if (ipl_block.hdr.flags & IPL_PL_FLAG_SIPL)
867 pr_info("Linux is running with Secure-IPL enabled\n");
868 else
869 pr_info("Linux is running with Secure-IPL disabled\n");
870 ptr = __va(early_ipl_comp_list_addr);
871 end = (void *) ptr + early_ipl_comp_list_size;
872 pr_info("The IPL report contains the following components:\n");
873 while (ptr < end) {
874 if (ptr->flags & IPL_RB_COMPONENT_FLAG_SIGNED) {
875 if (ptr->flags & IPL_RB_COMPONENT_FLAG_VERIFIED)
876 str = "signed, verified";
877 else
878 str = "signed, verification failed";
879 } else {
880 str = "not signed";
881 }
882 pr_info("%016llx - %016llx (%s)\n",
883 ptr->addr, ptr->addr + ptr->len, str);
884 ptr++;
885 }
886}
887
888/*
889 * Setup function called from init/main.c just after the banner
890 * was printed.
891 */
892
893void __init setup_arch(char **cmdline_p)
894{
895 /*
896 * print what head.S has found out about the machine
897 */
898 if (MACHINE_IS_VM)
899 pr_info("Linux is running as a z/VM "
900 "guest operating system in 64-bit mode\n");
901 else if (MACHINE_IS_KVM)
902 pr_info("Linux is running under KVM in 64-bit mode\n");
903 else if (MACHINE_IS_LPAR)
904 pr_info("Linux is running natively in 64-bit mode\n");
905 else
906 pr_info("Linux is running as a guest in 64-bit mode\n");
907
908 if (have_relocated_lowcore())
909 pr_info("Lowcore relocated to 0x%px\n", get_lowcore());
910
911 log_component_list();
912
913 /* Have one command line that is parsed and saved in /proc/cmdline */
914 /* boot_command_line has been already set up in early.c */
915 *cmdline_p = boot_command_line;
916
917 ROOT_DEV = Root_RAM0;
918
919 setup_initial_init_mm(_text, _etext, _edata, _end);
920
921 if (IS_ENABLED(CONFIG_EXPOLINE_AUTO))
922 nospec_auto_detect();
923
924 jump_label_init();
925 parse_early_param();
926#ifdef CONFIG_CRASH_DUMP
927 /* Deactivate elfcorehdr= kernel parameter */
928 elfcorehdr_addr = ELFCORE_ADDR_MAX;
929#endif
930
931 os_info_init();
932 setup_ipl();
933 setup_control_program_code();
934
935 /* Do some memory reservations *before* memory is added to memblock */
936 reserve_pgtables();
937 reserve_lowcore();
938 reserve_kernel();
939 reserve_initrd();
940 reserve_certificate_list();
941 reserve_physmem_info();
942 memblock_set_current_limit(ident_map_size);
943 memblock_allow_resize();
944
945 /* Get information about *all* installed memory */
946 memblock_add_physmem_info();
947
948 free_physmem_info();
949 setup_memory_end();
950 memblock_dump_all();
951 setup_memory();
952
953 relocate_amode31_section();
954 setup_cr();
955 setup_uv();
956 dma_contiguous_reserve(ident_map_size);
957 vmcp_cma_reserve();
958 if (MACHINE_HAS_EDAT2)
959 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
960
961 reserve_crashkernel();
962#ifdef CONFIG_CRASH_DUMP
963 /*
964 * Be aware that smp_save_dump_secondary_cpus() triggers a system reset.
965 * Therefore CPU and device initialization should be done afterwards.
966 */
967 smp_save_dump_secondary_cpus();
968#endif
969
970 setup_resources();
971 setup_lowcore();
972 smp_fill_possible_mask();
973 cpu_detect_mhz_feature();
974 cpu_init();
975 numa_setup();
976 smp_detect_cpus();
977 topology_init_early();
978
979 if (test_facility(193))
980 static_branch_enable(&cpu_has_bear);
981
982 /*
983 * Create kernel page tables.
984 */
985 paging_init();
986
987 /*
988 * After paging_init created the kernel page table, the new PSWs
989 * in lowcore can now run with DAT enabled.
990 */
991#ifdef CONFIG_CRASH_DUMP
992 smp_save_dump_ipl_cpu();
993#endif
994
995 /* Setup default console */
996 conmode_default();
997 set_preferred_console();
998
999 apply_alternative_instructions();
1000 if (IS_ENABLED(CONFIG_EXPOLINE))
1001 nospec_init_branches();
1002
1003 /* Setup zfcp/nvme dump support */
1004 setup_zfcpdump();
1005
1006 /* Add system specific data to the random pool */
1007 setup_randomness();
1008}
1009
1010void __init arch_cpu_finalize_init(void)
1011{
1012 sclp_init();
1013}
1/*
2 * S390 version
3 * Copyright IBM Corp. 1999, 2012
4 * Author(s): Hartmut Penner (hp@de.ibm.com),
5 * Martin Schwidefsky (schwidefsky@de.ibm.com)
6 *
7 * Derived from "arch/i386/kernel/setup.c"
8 * Copyright (C) 1995, Linus Torvalds
9 */
10
11/*
12 * This file handles the architecture-dependent parts of initialization
13 */
14
15#define KMSG_COMPONENT "setup"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/errno.h>
19#include <linux/export.h>
20#include <linux/sched.h>
21#include <linux/kernel.h>
22#include <linux/memblock.h>
23#include <linux/mm.h>
24#include <linux/stddef.h>
25#include <linux/unistd.h>
26#include <linux/ptrace.h>
27#include <linux/random.h>
28#include <linux/user.h>
29#include <linux/tty.h>
30#include <linux/ioport.h>
31#include <linux/delay.h>
32#include <linux/init.h>
33#include <linux/initrd.h>
34#include <linux/bootmem.h>
35#include <linux/root_dev.h>
36#include <linux/console.h>
37#include <linux/kernel_stat.h>
38#include <linux/dma-contiguous.h>
39#include <linux/device.h>
40#include <linux/notifier.h>
41#include <linux/pfn.h>
42#include <linux/ctype.h>
43#include <linux/reboot.h>
44#include <linux/topology.h>
45#include <linux/kexec.h>
46#include <linux/crash_dump.h>
47#include <linux/memory.h>
48#include <linux/compat.h>
49
50#include <asm/ipl.h>
51#include <asm/facility.h>
52#include <asm/smp.h>
53#include <asm/mmu_context.h>
54#include <asm/cpcmd.h>
55#include <asm/lowcore.h>
56#include <asm/irq.h>
57#include <asm/page.h>
58#include <asm/ptrace.h>
59#include <asm/sections.h>
60#include <asm/ebcdic.h>
61#include <asm/kvm_virtio.h>
62#include <asm/diag.h>
63#include <asm/os_info.h>
64#include <asm/sclp.h>
65#include <asm/sysinfo.h>
66#include <asm/numa.h>
67#include "entry.h"
68
69/*
70 * Machine setup..
71 */
72unsigned int console_mode = 0;
73EXPORT_SYMBOL(console_mode);
74
75unsigned int console_devno = -1;
76EXPORT_SYMBOL(console_devno);
77
78unsigned int console_irq = -1;
79EXPORT_SYMBOL(console_irq);
80
81unsigned long elf_hwcap __read_mostly = 0;
82char elf_platform[ELF_PLATFORM_SIZE];
83
84unsigned long int_hwcap = 0;
85
86int __initdata memory_end_set;
87unsigned long __initdata memory_end;
88unsigned long __initdata max_physmem_end;
89
90unsigned long VMALLOC_START;
91EXPORT_SYMBOL(VMALLOC_START);
92
93unsigned long VMALLOC_END;
94EXPORT_SYMBOL(VMALLOC_END);
95
96struct page *vmemmap;
97EXPORT_SYMBOL(vmemmap);
98
99unsigned long MODULES_VADDR;
100unsigned long MODULES_END;
101
102/* An array with a pointer to the lowcore of every CPU. */
103struct lowcore *lowcore_ptr[NR_CPUS];
104EXPORT_SYMBOL(lowcore_ptr);
105
106/*
107 * This is set up by the setup-routine at boot-time
108 * for S390 need to find out, what we have to setup
109 * using address 0x10400 ...
110 */
111
112#include <asm/setup.h>
113
114/*
115 * condev= and conmode= setup parameter.
116 */
117
118static int __init condev_setup(char *str)
119{
120 int vdev;
121
122 vdev = simple_strtoul(str, &str, 0);
123 if (vdev >= 0 && vdev < 65536) {
124 console_devno = vdev;
125 console_irq = -1;
126 }
127 return 1;
128}
129
130__setup("condev=", condev_setup);
131
132static void __init set_preferred_console(void)
133{
134 if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
135 add_preferred_console("ttyS", 0, NULL);
136 else if (CONSOLE_IS_3270)
137 add_preferred_console("tty3270", 0, NULL);
138 else if (CONSOLE_IS_VT220)
139 add_preferred_console("ttyS", 1, NULL);
140 else if (CONSOLE_IS_HVC)
141 add_preferred_console("hvc", 0, NULL);
142}
143
144static int __init conmode_setup(char *str)
145{
146#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
147 if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
148 SET_CONSOLE_SCLP;
149#endif
150#if defined(CONFIG_TN3215_CONSOLE)
151 if (strncmp(str, "3215", 5) == 0)
152 SET_CONSOLE_3215;
153#endif
154#if defined(CONFIG_TN3270_CONSOLE)
155 if (strncmp(str, "3270", 5) == 0)
156 SET_CONSOLE_3270;
157#endif
158 set_preferred_console();
159 return 1;
160}
161
162__setup("conmode=", conmode_setup);
163
164static void __init conmode_default(void)
165{
166 char query_buffer[1024];
167 char *ptr;
168
169 if (MACHINE_IS_VM) {
170 cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
171 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
172 ptr = strstr(query_buffer, "SUBCHANNEL =");
173 console_irq = simple_strtoul(ptr + 13, NULL, 16);
174 cpcmd("QUERY TERM", query_buffer, 1024, NULL);
175 ptr = strstr(query_buffer, "CONMODE");
176 /*
177 * Set the conmode to 3215 so that the device recognition
178 * will set the cu_type of the console to 3215. If the
179 * conmode is 3270 and we don't set it back then both
180 * 3215 and the 3270 driver will try to access the console
181 * device (3215 as console and 3270 as normal tty).
182 */
183 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
184 if (ptr == NULL) {
185#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
186 SET_CONSOLE_SCLP;
187#endif
188 return;
189 }
190 if (strncmp(ptr + 8, "3270", 4) == 0) {
191#if defined(CONFIG_TN3270_CONSOLE)
192 SET_CONSOLE_3270;
193#elif defined(CONFIG_TN3215_CONSOLE)
194 SET_CONSOLE_3215;
195#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
196 SET_CONSOLE_SCLP;
197#endif
198 } else if (strncmp(ptr + 8, "3215", 4) == 0) {
199#if defined(CONFIG_TN3215_CONSOLE)
200 SET_CONSOLE_3215;
201#elif defined(CONFIG_TN3270_CONSOLE)
202 SET_CONSOLE_3270;
203#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
204 SET_CONSOLE_SCLP;
205#endif
206 }
207 } else if (MACHINE_IS_KVM) {
208 if (sclp.has_vt220 && IS_ENABLED(CONFIG_SCLP_VT220_CONSOLE))
209 SET_CONSOLE_VT220;
210 else if (sclp.has_linemode && IS_ENABLED(CONFIG_SCLP_CONSOLE))
211 SET_CONSOLE_SCLP;
212 else
213 SET_CONSOLE_HVC;
214 } else {
215#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
216 SET_CONSOLE_SCLP;
217#endif
218 }
219}
220
221#ifdef CONFIG_CRASH_DUMP
222static void __init setup_zfcpdump(void)
223{
224 if (ipl_info.type != IPL_TYPE_FCP_DUMP)
225 return;
226 if (OLDMEM_BASE)
227 return;
228 strcat(boot_command_line, " cio_ignore=all,!ipldev,!condev");
229 console_loglevel = 2;
230}
231#else
232static inline void setup_zfcpdump(void) {}
233#endif /* CONFIG_CRASH_DUMP */
234
235 /*
236 * Reboot, halt and power_off stubs. They just call _machine_restart,
237 * _machine_halt or _machine_power_off.
238 */
239
240void machine_restart(char *command)
241{
242 if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
243 /*
244 * Only unblank the console if we are called in enabled
245 * context or a bust_spinlocks cleared the way for us.
246 */
247 console_unblank();
248 _machine_restart(command);
249}
250
251void machine_halt(void)
252{
253 if (!in_interrupt() || oops_in_progress)
254 /*
255 * Only unblank the console if we are called in enabled
256 * context or a bust_spinlocks cleared the way for us.
257 */
258 console_unblank();
259 _machine_halt();
260}
261
262void machine_power_off(void)
263{
264 if (!in_interrupt() || oops_in_progress)
265 /*
266 * Only unblank the console if we are called in enabled
267 * context or a bust_spinlocks cleared the way for us.
268 */
269 console_unblank();
270 _machine_power_off();
271}
272
273/*
274 * Dummy power off function.
275 */
276void (*pm_power_off)(void) = machine_power_off;
277EXPORT_SYMBOL_GPL(pm_power_off);
278
279static int __init early_parse_mem(char *p)
280{
281 memory_end = memparse(p, &p);
282 memory_end &= PAGE_MASK;
283 memory_end_set = 1;
284 return 0;
285}
286early_param("mem", early_parse_mem);
287
288static int __init parse_vmalloc(char *arg)
289{
290 if (!arg)
291 return -EINVAL;
292 VMALLOC_END = (memparse(arg, &arg) + PAGE_SIZE - 1) & PAGE_MASK;
293 return 0;
294}
295early_param("vmalloc", parse_vmalloc);
296
297void *restart_stack __section(.data);
298
299static void __init setup_lowcore(void)
300{
301 struct lowcore *lc;
302
303 /*
304 * Setup lowcore for boot cpu
305 */
306 BUILD_BUG_ON(sizeof(struct lowcore) != LC_PAGES * 4096);
307 lc = memblock_virt_alloc_low(sizeof(*lc), sizeof(*lc));
308 lc->restart_psw.mask = PSW_KERNEL_BITS;
309 lc->restart_psw.addr = (unsigned long) restart_int_handler;
310 lc->external_new_psw.mask = PSW_KERNEL_BITS |
311 PSW_MASK_DAT | PSW_MASK_MCHECK;
312 lc->external_new_psw.addr = (unsigned long) ext_int_handler;
313 lc->svc_new_psw.mask = PSW_KERNEL_BITS |
314 PSW_MASK_DAT | PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK;
315 lc->svc_new_psw.addr = (unsigned long) system_call;
316 lc->program_new_psw.mask = PSW_KERNEL_BITS |
317 PSW_MASK_DAT | PSW_MASK_MCHECK;
318 lc->program_new_psw.addr = (unsigned long) pgm_check_handler;
319 lc->mcck_new_psw.mask = PSW_KERNEL_BITS;
320 lc->mcck_new_psw.addr = (unsigned long) mcck_int_handler;
321 lc->io_new_psw.mask = PSW_KERNEL_BITS |
322 PSW_MASK_DAT | PSW_MASK_MCHECK;
323 lc->io_new_psw.addr = (unsigned long) io_int_handler;
324 lc->clock_comparator = -1ULL;
325 lc->kernel_stack = ((unsigned long) &init_thread_union)
326 + THREAD_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
327 lc->async_stack = (unsigned long)
328 memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE)
329 + ASYNC_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
330 lc->panic_stack = (unsigned long)
331 memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE)
332 + PAGE_SIZE - STACK_FRAME_OVERHEAD - sizeof(struct pt_regs);
333 lc->current_task = (unsigned long)&init_task;
334 lc->lpp = LPP_MAGIC;
335 lc->machine_flags = S390_lowcore.machine_flags;
336 lc->preempt_count = S390_lowcore.preempt_count;
337 lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
338 memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
339 MAX_FACILITY_BIT/8);
340 if (MACHINE_HAS_VX)
341 lc->vector_save_area_addr =
342 (unsigned long) &lc->vector_save_area;
343 lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0];
344 lc->sync_enter_timer = S390_lowcore.sync_enter_timer;
345 lc->async_enter_timer = S390_lowcore.async_enter_timer;
346 lc->exit_timer = S390_lowcore.exit_timer;
347 lc->user_timer = S390_lowcore.user_timer;
348 lc->system_timer = S390_lowcore.system_timer;
349 lc->steal_timer = S390_lowcore.steal_timer;
350 lc->last_update_timer = S390_lowcore.last_update_timer;
351 lc->last_update_clock = S390_lowcore.last_update_clock;
352
353 restart_stack = memblock_virt_alloc(ASYNC_SIZE, ASYNC_SIZE);
354 restart_stack += ASYNC_SIZE;
355
356 /*
357 * Set up PSW restart to call ipl.c:do_restart(). Copy the relevant
358 * restart data to the absolute zero lowcore. This is necessary if
359 * PSW restart is done on an offline CPU that has lowcore zero.
360 */
361 lc->restart_stack = (unsigned long) restart_stack;
362 lc->restart_fn = (unsigned long) do_restart;
363 lc->restart_data = 0;
364 lc->restart_source = -1UL;
365
366 /* Setup absolute zero lowcore */
367 mem_assign_absolute(S390_lowcore.restart_stack, lc->restart_stack);
368 mem_assign_absolute(S390_lowcore.restart_fn, lc->restart_fn);
369 mem_assign_absolute(S390_lowcore.restart_data, lc->restart_data);
370 mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
371 mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
372
373#ifdef CONFIG_SMP
374 lc->spinlock_lockval = arch_spin_lockval(0);
375#endif
376
377 set_prefix((u32)(unsigned long) lc);
378 lowcore_ptr[0] = lc;
379}
380
381static struct resource code_resource = {
382 .name = "Kernel code",
383 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
384};
385
386static struct resource data_resource = {
387 .name = "Kernel data",
388 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
389};
390
391static struct resource bss_resource = {
392 .name = "Kernel bss",
393 .flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM,
394};
395
396static struct resource __initdata *standard_resources[] = {
397 &code_resource,
398 &data_resource,
399 &bss_resource,
400};
401
402static void __init setup_resources(void)
403{
404 struct resource *res, *std_res, *sub_res;
405 struct memblock_region *reg;
406 int j;
407
408 code_resource.start = (unsigned long) &_text;
409 code_resource.end = (unsigned long) &_etext - 1;
410 data_resource.start = (unsigned long) &_etext;
411 data_resource.end = (unsigned long) &_edata - 1;
412 bss_resource.start = (unsigned long) &__bss_start;
413 bss_resource.end = (unsigned long) &__bss_stop - 1;
414
415 for_each_memblock(memory, reg) {
416 res = memblock_virt_alloc(sizeof(*res), 8);
417 res->flags = IORESOURCE_BUSY | IORESOURCE_SYSTEM_RAM;
418
419 res->name = "System RAM";
420 res->start = reg->base;
421 res->end = reg->base + reg->size - 1;
422 request_resource(&iomem_resource, res);
423
424 for (j = 0; j < ARRAY_SIZE(standard_resources); j++) {
425 std_res = standard_resources[j];
426 if (std_res->start < res->start ||
427 std_res->start > res->end)
428 continue;
429 if (std_res->end > res->end) {
430 sub_res = memblock_virt_alloc(sizeof(*sub_res), 8);
431 *sub_res = *std_res;
432 sub_res->end = res->end;
433 std_res->start = res->end + 1;
434 request_resource(res, sub_res);
435 } else {
436 request_resource(res, std_res);
437 }
438 }
439 }
440#ifdef CONFIG_CRASH_DUMP
441 /*
442 * Re-add removed crash kernel memory as reserved memory. This makes
443 * sure it will be mapped with the identity mapping and struct pages
444 * will be created, so it can be resized later on.
445 * However add it later since the crash kernel resource should not be
446 * part of the System RAM resource.
447 */
448 if (crashk_res.end) {
449 memblock_add_node(crashk_res.start, resource_size(&crashk_res), 0);
450 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
451 insert_resource(&iomem_resource, &crashk_res);
452 }
453#endif
454}
455
456static void __init setup_memory_end(void)
457{
458 unsigned long vmax, vmalloc_size, tmp;
459
460 /* Choose kernel address space layout: 2, 3, or 4 levels. */
461 vmalloc_size = VMALLOC_END ?: (128UL << 30) - MODULES_LEN;
462 tmp = (memory_end ?: max_physmem_end) / PAGE_SIZE;
463 tmp = tmp * (sizeof(struct page) + PAGE_SIZE);
464 if (tmp + vmalloc_size + MODULES_LEN <= (1UL << 42))
465 vmax = 1UL << 42; /* 3-level kernel page table */
466 else
467 vmax = 1UL << 53; /* 4-level kernel page table */
468 /* module area is at the end of the kernel address space. */
469 MODULES_END = vmax;
470 MODULES_VADDR = MODULES_END - MODULES_LEN;
471 VMALLOC_END = MODULES_VADDR;
472 VMALLOC_START = vmax - vmalloc_size;
473
474 /* Split remaining virtual space between 1:1 mapping & vmemmap array */
475 tmp = VMALLOC_START / (PAGE_SIZE + sizeof(struct page));
476 /* vmemmap contains a multiple of PAGES_PER_SECTION struct pages */
477 tmp = SECTION_ALIGN_UP(tmp);
478 tmp = VMALLOC_START - tmp * sizeof(struct page);
479 tmp &= ~((vmax >> 11) - 1); /* align to page table level */
480 tmp = min(tmp, 1UL << MAX_PHYSMEM_BITS);
481 vmemmap = (struct page *) tmp;
482
483 /* Take care that memory_end is set and <= vmemmap */
484 memory_end = min(memory_end ?: max_physmem_end, tmp);
485 max_pfn = max_low_pfn = PFN_DOWN(memory_end);
486 memblock_remove(memory_end, ULONG_MAX);
487
488 pr_notice("The maximum memory size is %luMB\n", memory_end >> 20);
489}
490
491static void __init setup_vmcoreinfo(void)
492{
493 mem_assign_absolute(S390_lowcore.vmcore_info, paddr_vmcoreinfo_note());
494}
495
496#ifdef CONFIG_CRASH_DUMP
497
498/*
499 * When kdump is enabled, we have to ensure that no memory from
500 * the area [0 - crashkernel memory size] and
501 * [crashk_res.start - crashk_res.end] is set offline.
502 */
503static int kdump_mem_notifier(struct notifier_block *nb,
504 unsigned long action, void *data)
505{
506 struct memory_notify *arg = data;
507
508 if (action != MEM_GOING_OFFLINE)
509 return NOTIFY_OK;
510 if (arg->start_pfn < PFN_DOWN(resource_size(&crashk_res)))
511 return NOTIFY_BAD;
512 if (arg->start_pfn > PFN_DOWN(crashk_res.end))
513 return NOTIFY_OK;
514 if (arg->start_pfn + arg->nr_pages - 1 < PFN_DOWN(crashk_res.start))
515 return NOTIFY_OK;
516 return NOTIFY_BAD;
517}
518
519static struct notifier_block kdump_mem_nb = {
520 .notifier_call = kdump_mem_notifier,
521};
522
523#endif
524
525/*
526 * Make sure that the area behind memory_end is protected
527 */
528static void reserve_memory_end(void)
529{
530#ifdef CONFIG_CRASH_DUMP
531 if (ipl_info.type == IPL_TYPE_FCP_DUMP &&
532 !OLDMEM_BASE && sclp.hsa_size) {
533 memory_end = sclp.hsa_size;
534 memory_end &= PAGE_MASK;
535 memory_end_set = 1;
536 }
537#endif
538 if (!memory_end_set)
539 return;
540 memblock_reserve(memory_end, ULONG_MAX);
541}
542
543/*
544 * Make sure that oldmem, where the dump is stored, is protected
545 */
546static void reserve_oldmem(void)
547{
548#ifdef CONFIG_CRASH_DUMP
549 if (OLDMEM_BASE)
550 /* Forget all memory above the running kdump system */
551 memblock_reserve(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
552#endif
553}
554
555/*
556 * Make sure that oldmem, where the dump is stored, is protected
557 */
558static void remove_oldmem(void)
559{
560#ifdef CONFIG_CRASH_DUMP
561 if (OLDMEM_BASE)
562 /* Forget all memory above the running kdump system */
563 memblock_remove(OLDMEM_SIZE, (phys_addr_t)ULONG_MAX);
564#endif
565}
566
567/*
568 * Reserve memory for kdump kernel to be loaded with kexec
569 */
570static void __init reserve_crashkernel(void)
571{
572#ifdef CONFIG_CRASH_DUMP
573 unsigned long long crash_base, crash_size;
574 phys_addr_t low, high;
575 int rc;
576
577 rc = parse_crashkernel(boot_command_line, memory_end, &crash_size,
578 &crash_base);
579
580 crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
581 crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
582 if (rc || crash_size == 0)
583 return;
584
585 if (memblock.memory.regions[0].size < crash_size) {
586 pr_info("crashkernel reservation failed: %s\n",
587 "first memory chunk must be at least crashkernel size");
588 return;
589 }
590
591 low = crash_base ?: OLDMEM_BASE;
592 high = low + crash_size;
593 if (low >= OLDMEM_BASE && high <= OLDMEM_BASE + OLDMEM_SIZE) {
594 /* The crashkernel fits into OLDMEM, reuse OLDMEM */
595 crash_base = low;
596 } else {
597 /* Find suitable area in free memory */
598 low = max_t(unsigned long, crash_size, sclp.hsa_size);
599 high = crash_base ? crash_base + crash_size : ULONG_MAX;
600
601 if (crash_base && crash_base < low) {
602 pr_info("crashkernel reservation failed: %s\n",
603 "crash_base too low");
604 return;
605 }
606 low = crash_base ?: low;
607 crash_base = memblock_find_in_range(low, high, crash_size,
608 KEXEC_CRASH_MEM_ALIGN);
609 }
610
611 if (!crash_base) {
612 pr_info("crashkernel reservation failed: %s\n",
613 "no suitable area found");
614 return;
615 }
616
617 if (register_memory_notifier(&kdump_mem_nb))
618 return;
619
620 if (!OLDMEM_BASE && MACHINE_IS_VM)
621 diag10_range(PFN_DOWN(crash_base), PFN_DOWN(crash_size));
622 crashk_res.start = crash_base;
623 crashk_res.end = crash_base + crash_size - 1;
624 memblock_remove(crash_base, crash_size);
625 pr_info("Reserving %lluMB of memory at %lluMB "
626 "for crashkernel (System RAM: %luMB)\n",
627 crash_size >> 20, crash_base >> 20,
628 (unsigned long)memblock.memory.total_size >> 20);
629 os_info_crashkernel_add(crash_base, crash_size);
630#endif
631}
632
633/*
634 * Reserve the initrd from being used by memblock
635 */
636static void __init reserve_initrd(void)
637{
638#ifdef CONFIG_BLK_DEV_INITRD
639 initrd_start = INITRD_START;
640 initrd_end = initrd_start + INITRD_SIZE;
641 memblock_reserve(INITRD_START, INITRD_SIZE);
642#endif
643}
644
645/*
646 * Check for initrd being in usable memory
647 */
648static void __init check_initrd(void)
649{
650#ifdef CONFIG_BLK_DEV_INITRD
651 if (INITRD_START && INITRD_SIZE &&
652 !memblock_is_region_memory(INITRD_START, INITRD_SIZE)) {
653 pr_err("The initial RAM disk does not fit into the memory\n");
654 memblock_free(INITRD_START, INITRD_SIZE);
655 initrd_start = initrd_end = 0;
656 }
657#endif
658}
659
660/*
661 * Reserve memory used for lowcore/command line/kernel image.
662 */
663static void __init reserve_kernel(void)
664{
665 unsigned long start_pfn = PFN_UP(__pa(&_end));
666
667#ifdef CONFIG_DMA_API_DEBUG
668 /*
669 * DMA_API_DEBUG code stumbles over addresses from the
670 * range [_ehead, _stext]. Mark the memory as reserved
671 * so it is not used for CONFIG_DMA_API_DEBUG=y.
672 */
673 memblock_reserve(0, PFN_PHYS(start_pfn));
674#else
675 memblock_reserve(0, (unsigned long)_ehead);
676 memblock_reserve((unsigned long)_stext, PFN_PHYS(start_pfn)
677 - (unsigned long)_stext);
678#endif
679}
680
681static void __init setup_memory(void)
682{
683 struct memblock_region *reg;
684
685 /*
686 * Init storage key for present memory
687 */
688 for_each_memblock(memory, reg) {
689 storage_key_init_range(reg->base, reg->base + reg->size);
690 }
691 psw_set_key(PAGE_DEFAULT_KEY);
692
693 /* Only cosmetics */
694 memblock_enforce_memory_limit(memblock_end_of_DRAM());
695}
696
697/*
698 * Setup hardware capabilities.
699 */
700static int __init setup_hwcaps(void)
701{
702 static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
703 struct cpuid cpu_id;
704 int i;
705
706 /*
707 * The store facility list bits numbers as found in the principles
708 * of operation are numbered with bit 1UL<<31 as number 0 to
709 * bit 1UL<<0 as number 31.
710 * Bit 0: instructions named N3, "backported" to esa-mode
711 * Bit 2: z/Architecture mode is active
712 * Bit 7: the store-facility-list-extended facility is installed
713 * Bit 17: the message-security assist is installed
714 * Bit 19: the long-displacement facility is installed
715 * Bit 21: the extended-immediate facility is installed
716 * Bit 22: extended-translation facility 3 is installed
717 * Bit 30: extended-translation facility 3 enhancement facility
718 * These get translated to:
719 * HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
720 * HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
721 * HWCAP_S390_LDISP bit 4, HWCAP_S390_EIMM bit 5 and
722 * HWCAP_S390_ETF3EH bit 8 (22 && 30).
723 */
724 for (i = 0; i < 6; i++)
725 if (test_facility(stfl_bits[i]))
726 elf_hwcap |= 1UL << i;
727
728 if (test_facility(22) && test_facility(30))
729 elf_hwcap |= HWCAP_S390_ETF3EH;
730
731 /*
732 * Check for additional facilities with store-facility-list-extended.
733 * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
734 * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
735 * as stored by stfl, bits 32-xxx contain additional facilities.
736 * How many facility words are stored depends on the number of
737 * doublewords passed to the instruction. The additional facilities
738 * are:
739 * Bit 42: decimal floating point facility is installed
740 * Bit 44: perform floating point operation facility is installed
741 * translated to:
742 * HWCAP_S390_DFP bit 6 (42 && 44).
743 */
744 if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
745 elf_hwcap |= HWCAP_S390_DFP;
746
747 /*
748 * Huge page support HWCAP_S390_HPAGE is bit 7.
749 */
750 if (MACHINE_HAS_HPAGE)
751 elf_hwcap |= HWCAP_S390_HPAGE;
752
753 /*
754 * 64-bit register support for 31-bit processes
755 * HWCAP_S390_HIGH_GPRS is bit 9.
756 */
757 elf_hwcap |= HWCAP_S390_HIGH_GPRS;
758
759 /*
760 * Transactional execution support HWCAP_S390_TE is bit 10.
761 */
762 if (test_facility(50) && test_facility(73))
763 elf_hwcap |= HWCAP_S390_TE;
764
765 /*
766 * Vector extension HWCAP_S390_VXRS is bit 11. The Vector extension
767 * can be disabled with the "novx" parameter. Use MACHINE_HAS_VX
768 * instead of facility bit 129.
769 */
770 if (MACHINE_HAS_VX)
771 elf_hwcap |= HWCAP_S390_VXRS;
772 get_cpu_id(&cpu_id);
773 add_device_randomness(&cpu_id, sizeof(cpu_id));
774 switch (cpu_id.machine) {
775 case 0x2064:
776 case 0x2066:
777 default: /* Use "z900" as default for 64 bit kernels. */
778 strcpy(elf_platform, "z900");
779 break;
780 case 0x2084:
781 case 0x2086:
782 strcpy(elf_platform, "z990");
783 break;
784 case 0x2094:
785 case 0x2096:
786 strcpy(elf_platform, "z9-109");
787 break;
788 case 0x2097:
789 case 0x2098:
790 strcpy(elf_platform, "z10");
791 break;
792 case 0x2817:
793 case 0x2818:
794 strcpy(elf_platform, "z196");
795 break;
796 case 0x2827:
797 case 0x2828:
798 strcpy(elf_platform, "zEC12");
799 break;
800 case 0x2964:
801 case 0x2965:
802 strcpy(elf_platform, "z13");
803 break;
804 }
805
806 /*
807 * Virtualization support HWCAP_INT_SIE is bit 0.
808 */
809 if (sclp.has_sief2)
810 int_hwcap |= HWCAP_INT_SIE;
811
812 return 0;
813}
814arch_initcall(setup_hwcaps);
815
816/*
817 * Add system information as device randomness
818 */
819static void __init setup_randomness(void)
820{
821 struct sysinfo_3_2_2 *vmms;
822
823 vmms = (struct sysinfo_3_2_2 *) memblock_alloc(PAGE_SIZE, PAGE_SIZE);
824 if (stsi(vmms, 3, 2, 2) == 0 && vmms->count)
825 add_device_randomness(&vmms->vm, sizeof(vmms->vm[0]) * vmms->count);
826 memblock_free((unsigned long) vmms, PAGE_SIZE);
827}
828
829/*
830 * Find the correct size for the task_struct. This depends on
831 * the size of the struct fpu at the end of the thread_struct
832 * which is embedded in the task_struct.
833 */
834static void __init setup_task_size(void)
835{
836 int task_size = sizeof(struct task_struct);
837
838 if (!MACHINE_HAS_VX) {
839 task_size -= sizeof(__vector128) * __NUM_VXRS;
840 task_size += sizeof(freg_t) * __NUM_FPRS;
841 }
842 arch_task_struct_size = task_size;
843}
844
845/*
846 * Setup function called from init/main.c just after the banner
847 * was printed.
848 */
849
850void __init setup_arch(char **cmdline_p)
851{
852 /*
853 * print what head.S has found out about the machine
854 */
855 if (MACHINE_IS_VM)
856 pr_info("Linux is running as a z/VM "
857 "guest operating system in 64-bit mode\n");
858 else if (MACHINE_IS_KVM)
859 pr_info("Linux is running under KVM in 64-bit mode\n");
860 else if (MACHINE_IS_LPAR)
861 pr_info("Linux is running natively in 64-bit mode\n");
862
863 /* Have one command line that is parsed and saved in /proc/cmdline */
864 /* boot_command_line has been already set up in early.c */
865 *cmdline_p = boot_command_line;
866
867 ROOT_DEV = Root_RAM0;
868
869 /* Is init_mm really needed? */
870 init_mm.start_code = PAGE_OFFSET;
871 init_mm.end_code = (unsigned long) &_etext;
872 init_mm.end_data = (unsigned long) &_edata;
873 init_mm.brk = (unsigned long) &_end;
874
875 parse_early_param();
876#ifdef CONFIG_CRASH_DUMP
877 /* Deactivate elfcorehdr= kernel parameter */
878 elfcorehdr_addr = ELFCORE_ADDR_MAX;
879#endif
880
881 os_info_init();
882 setup_ipl();
883 setup_task_size();
884
885 /* Do some memory reservations *before* memory is added to memblock */
886 reserve_memory_end();
887 reserve_oldmem();
888 reserve_kernel();
889 reserve_initrd();
890 memblock_allow_resize();
891
892 /* Get information about *all* installed memory */
893 detect_memory_memblock();
894
895 remove_oldmem();
896
897 /*
898 * Make sure all chunks are MAX_ORDER aligned so we don't need the
899 * extra checks that HOLES_IN_ZONE would require.
900 *
901 * Is this still required?
902 */
903 memblock_trim_memory(1UL << (MAX_ORDER - 1 + PAGE_SHIFT));
904
905 setup_memory_end();
906 setup_memory();
907 dma_contiguous_reserve(memory_end);
908
909 check_initrd();
910 reserve_crashkernel();
911#ifdef CONFIG_CRASH_DUMP
912 /*
913 * Be aware that smp_save_dump_cpus() triggers a system reset.
914 * Therefore CPU and device initialization should be done afterwards.
915 */
916 smp_save_dump_cpus();
917#endif
918
919 setup_resources();
920 setup_vmcoreinfo();
921 setup_lowcore();
922 smp_fill_possible_mask();
923 cpu_detect_mhz_feature();
924 cpu_init();
925 numa_setup();
926 smp_detect_cpus();
927 topology_init_early();
928
929 /*
930 * Create kernel page tables and switch to virtual addressing.
931 */
932 paging_init();
933
934 /* Setup default console */
935 conmode_default();
936 set_preferred_console();
937
938 /* Setup zfcpdump support */
939 setup_zfcpdump();
940
941 /* Add system specific data to the random pool */
942 setup_randomness();
943}